// Me in the interpreter my first days of trying to understand
// things about what I'm seeing trying to read Scala sources.

scala> class WhatDoesThisSyntaxDo() { println("Constructed, IG") }
defined class WhatDoesThisSyntaxDo
//A class declaration with a constuctor with a single empty parameter list (`()`), and a constuctor body `println("Constructed, IG")`

scala> new WhatDoesThisSyntaxDo
Constructed, IG
res0: WhatDoesThisSyntaxDo = WhatDoesThisSyntaxDo@20011bf
//call the constructor -- you can leave off an empty parameter list. This is useful for java interop

scala> new WhatDoesThisSyntaxDo()
Constructed, IG
res1: WhatDoesThisSyntaxDo = WhatDoesThisSyntaxDo@7d3fb0ef
//call the constructor

scala> class WhatDoesThisSyntaxDo { println("Constructed, IG") }
defined class WhatDoesThisSyntaxDo
//A class declaration with a constuctor without a parameter list, and a constuctor body `println("Constructed, IG")`

scala> new WhatDoesThisSyntaxDo
Constructed, IG
res3: WhatDoesThisSyntaxDo = WhatDoesThisSyntaxDo@316cda31
//call the constructor

scala> new WhatDoesThisSyntaxDo()
Constructed, IG
res4: WhatDoesThisSyntaxDo = WhatDoesThisSyntaxDo@691567ea
//An artifact of Java interop. The runtime can't see that the constructor doesn't have a parameter list. For a normal method this would be an error.

scala> new WhatDoesThisSyntaxDo { println("Wtf is this now") }
Constructed, IG
Wtf is this now
res7: WhatDoesThisSyntaxDo = $anon$1@464aeb09
//Call the constructor of an anonymous class that extends WhatDDoesThisSyntaxDo with a constructor with body `println("Wtf is this now")` which will be called after the parent constructor

scala> new WhatDoesThisSyntaxDo() { println("Wtf is this now") }
Constructed, IG
Wtf is this now
res8: WhatDoesThisSyntaxDo = $anon$1@4fa0ee7e
//Call the constructor of an anonymous class that extends WhatDDoesThisSyntaxDo with a constructor with body `println("Wtf is this now")` which will be called after the parent constructor

scala> class Unclear extends WhatDoesThisSyntaxDo { println("Wtf is this now") }
defined class Unclear
//Declare a class `Unclear` that extends WhatDoesThisSyntaxDo with a constructor without a parameter list with body `println("Wtf is this now")`

scala> new Unclear
Constructed, IG
Wtf is this now
res10: Unclear = Unclear@6c9151c1

//Call the above constructor, which first calls its superclass constructor